Microphone boom arm



FIG. 1 is a rear elevation view of the microphone boom arm.

FIG. 2 is a left side elevation view of the microphone boom arm.

FIG. 3 is a front elevation view of the microphone boom arm.

FIG. 4 is a right side elevation view of the microphone boom arm.

FIG. 5 is a bottom plan view of the microphone boom arm; and,

FIG. 6 is a top plan view of the microphone boom arm. 

The ornamental design for the microphone boom arm, as shown and described. 